THE FACTS

WHAT: The 15th annual Mrs. T's Chicago Triathlon, the world's largesttriathlon with up to 4,700 amateur and professional competitors. WHEN: Sunday, with first wave of competitors starting at 6:30 a.m. WHERE: Chicago lakefront with swim at Monroe Harbor, bike on LakeShore Drive, run on lakefront running paths. Finish line is onWacker Drive at the Hyatt Regency Hotel. FORMAT: Pro Enhancer Sprint with .75k swim, 22k bike and 5k run;Olympic distance with 1.5k swim, 40k bike and 10k run. SCHEDULE: Pro Enhancer Sprint start, 6:30 a.m.; Olympic distancestart, 7:20 a.m.; pro athletes start, 9:55 a.m.; pro athletes finish,11:45 a.m.; awards ceremony, 2:30 p.m. PRO FIELD: More than 70 elite …